Ulfsark

An ulfsark was a lightly-armored infantryman who only wore wolf skins into battle. They had shields as well as a sword or axe, and were related to berserks, who wore bear skins.

History
Viking warriors who wore wolf skins into battle were known as Ulfsarks, another tradition of the Berserks (bear skins). These men were renowned for their tendency to go into battle frenzy. Ulfsarks fought on foot, armed mainly with axes and swords. They generally wore minimal armor, preferring the freedom of movement rather than the heavier protection.